[GHC] #7706: iOS patch no 5: pass host OS and arch to cabal

[GHC]

#7706: iOS patch no 5: pass host OS and arch to cabal
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Reporter:  StephenBlackheath  |          Owner:                  
    Type:  bug                |         Status:  patch           
Priority:  normal             |      Component:  Compiler        
 Version:  7.7                |       Keywords:                  
      Os:  Unknown/Multiple   |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown       |      Blockedby:                  
Blocking:                     |        Related:                  
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Comment(by StephenBlackheath):

 lukexi points out that Simon M said (in Cabal issue 1184) that it would be
 better to extract the hostOS and hostArch from the ghc passed to cabal via
 --with-ghc.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7706#comment:2>
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